ajax

 <script  type="text/javascript"  language="javascript">
    var  req;
    function  creatReq()
    {
        var  url ="www.hnguotong.com";
        if(window.XMLHttpRequest)
        {
           req  = new  XMLHttpRequest();
        }
        else  if(window.ActiveXObject)
       {
           req  = new  ActiveXObject("Microsoft.XMLHttp");
       }
       if(req)
       {
           req.open("get",url,true);
           req.onreadystatechange= callback;
           req.send(null);
       }
    }
    function  callback()
    {
      if(req.readystate==4)
      {
      if(req.status==200)
       {
         Dispaly();
        }
      }
      else{
         alert("服务器返回状态"+req.statusText);
      }
      else{
          document.getElementById("myTime").innerHTML="Data  Load";
       }
     }
     function  Dispaly()
     {
         document.getElementById("myTime").innerHTML =req.responseText;
     }
</script>